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Iridium tipped electrodes go hand in hand with miniaturized coil packs in all modern IC engines. The little chips on the electrodes reduce the voltage required to form the spark by focusing the active area between the electrodes. In my experience, as long as the electrodes still have those chips, the plugs are good. Plugs with burned electrodes quickly take out their coil packs because the increased voltage required to form the spark is also felt at the coil as the magnetic field collapses. Basically, the coil pack fails because it is forced to work harder than it should.
I've pulled perfectly good plugs from 200 Kmi engines and have no plans to mess with mine unless something else goes wrong. Not saying they're bullet proof. Just sharing my experience.
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